brain dump far away from /dev/null


Debian: change MAC address


ifconfig eth0 down
ifconfig eth0 hw ether 00-11-22-33-44-AA
ifconfig eth0 up


vi /etc/network/interfaces

iface eth0 inet dhcp
  hwaddress ether 00-11-22-33-44-AA


Got an error?

SIOCSIFHWADDR: Operation not permitted

Make sure you're root.


Get a list of all disconnected mailboxes in Exchange 2010

The following script cleans up all your Exchange databases (necessary to get a fresh list of all disconnected mailboxes) and creates an HTML and CSV file containing:

  • DisplayName of the mailbox
  • ServerName, on which the mailbox is stored
  • DatabaseName, in which the mailbox is stored
  • DisconnectDate, when the mailbox was disconnected from the user account (the HTML output is also sorted by this column)
  • DisconnectReason, guess it: why the mailbox was disconnected (i.e. because the user account was disabled)

Just copy&paste these lines into a powershell script:

# ExportDisconnectedMailboxes.ps1
# This script runs "Clean-MailboxDatabase" on all
# available databases and creates an HTML report
# of all disconnected mailboxes.
# Revision History
# 2012-01-20 Christoph Holas    Initial Version
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
Get-MailboxDatabase | Clean-MailboxDatabase
$MailboxDatabases = Get-MailboxDatabase
$DiscMailboxes = $MailboxDatabases | ForEach-Object { Get-MailboxStatistics -Database $_.Name | Where-Object {$_.DisconnectDate -ne $null}} | select DisplayName,ServerName,DatabaseName,DisconnectDate,DisconnectReason | sort DisconnectDate
$a = "<style>"
$a = $a + "TABLE{border-width: 1px;border-style: solid;border-color: black;border-collapse: collapse;}"
$a = $a + "TH{border-width: 1px;padding: 3px;border-style: solid;border-color: black;}"
$a = $a + "TD{border-width: 1px;padding: 3px;border-style: solid;border-color: black;}"
$a = $a + "</style>"
$DiscMailboxes | ConvertTo-Csv | Out-File DisconnectedMailboxes.csv
$DiscMailboxes | ConvertTo-Html -head $a | Out-File DisconnectedMailboxes.html

Don't hesitate to write a comment if this script was (not) helpful to you. 🙂


How to determine your current logon server/domain controller on Windows 7/8/8.1

If you ever need to find your current logon server on Windows 7 (don't know by heart if it also works on XP), you can just run the following command on your command line:

echo %logonserver:*\\=%

UPDATE 2015-Jan-12: also works on Windows 8/8.1

%logonserver% is a local variable with a value that looks like \\domaincontroller. With :*\\= you can strip the leading backslashes and get only the hostname as a result. I have no clue about the value of the variable if you start your machine without a network connection or a connection to a domain controller. It's just a quick&dirty solution and in my case it does the job.


Compatible WLAN adapters for WD TV Live HD and price comparison

A list of compatible devices for the awesome Western Digital TV HD Live Media player can be found here in the Knowledge Base of Western Digital.

To compare the prices of (most) of these wireless network adapters I have created a wishlist at the price comparision website Geizhals:

Last update of this wishlist: Jan 19th, 2012.

Oh, and if you're interested in buying the media player itself:



Exchange 2010: count messages in local mail queue

Hi there. Here's just a little script before I leave the office for today. If you want to know how many email messages are in your local mail queue (no matter which Exchange role: Mailbox, CAS, HubTransport or Edge) just run the following command in your Exchange PowerShell:

Get-Queue | where {$_.MessageCount -ne "0"} | select messagecount | Measure-Object -Sum MessageCount | Select-Object -ExpandProperty Count

I have optimized the output to be easily interpreted by our monitoring system.


How to enable a mailbox or distribution group to receive mail from external senders

In Exchange 2010 you can permit or deny that unauthenticated users (ie senders outside of the Exchange organisation) send mails to a mailbox or distribution group. This setting can be set either in the EMS (PowerShell) or in EMC (console).


Eclipse, Subclipse and a proxy server

I really had trouble synchronizing my source code with the Google Code repository when working in Amsterdam. Here's my workaround.

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4:3 games on a widescreen display

Recently I fired up Blizzard's WarCraft Edition. Usually I'm playing it on my Lenovo T60 notebook which has a 4:3 SXGA+ display. Playing it on my desktop computer with a 22" widescreen TFT was not so much fun because the image was stretched. So, I was looking for a solution to display 4:3 fullscreen applications not stretched to widescreen.



I decided to use a weblog instead of creating a personal website because I'm too lazy (and not creative enough) to create a design which represents me and my feelings, ideas, et cetera. A CMS (content management system) is easily set up and doesn't need too much maintenance.

Stay tuned for more.

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